(Changes sourcing throughout) Oct 20 (Reuters) – Activist investor Starboard Value has taken a nearly 5% stake in construction firm Fluor and plans to push for ways to boost the company's shares, two sources familiar with the matter told Reuters on Monday. Fluor has an almost 40% stake in small nuclear reactor developer NuScale Power, which has seen a jump in shares this year due to increased demand for data centers and other technologies fueled by the artificial-intelligence boom. Fluor's shares rose 6.7% after the bell following the Wall Street Journal report, which first reported the news. The stock has lost nearly 3% so far this year. Starboard is one of the industry's busiest activist investors. Its founder, Jeff Smith, is expected to detail some of the firm's investment ideas at the

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